A device and method for purifying liquid argon

Abstract

A device and method for purifying liquid argon. The device includes a liquid argon purification tower system, a heat exchange system, a heat source supply system, a cooling capacity replenishment system, and a waste liquid recovery system. Pure liquid argon is sent to the liquid argon purification tower system for rectification to obtain high-purity liquid argon. The gas from the heat source supply system is cooled by the heat exchange system and then enters the liquid argon purification tower system as a heat source. It is condensed and then heat exchanged After the system is cooled, it enters the liquid argon purification tower system as a cold source. The insufficient cooling capacity is provided by the cooling capacity replenishment system. The waste liquid enters the inlet of the circulating liquid oxygen pump of the original main air separation equipment for recycling, and the gas enters the heat source through the heat exchange system to provide System compression. The present invention is highly coupled between systems, is suitable for further purification of liquid argon of different purity, has a wide application range, and improves the overall economic benefits. At the same time, the device is arranged outside the original main air separation equipment, which has little influence on the modification of the original main air separation equipment, and is flexible in operation. Strong reproducibility.

Description

technical field [0001] The invention relates to gas separation technology. Specifically, a low-purity liquid argon is purified into high-purity liquid argon by using a low-temperature rectification method to design a device and method for purifying liquid argon, which belongs to the field of low-temperature technology. Background technique [0002] Argon is a rare gas with very inactive chemical properties. It is widely used in aircraft manufacturing, shipbuilding, atomic energy industry and machinery industry. Because it can neither burn nor support combustion, it is often used as a special metal, such as aluminum, magnesium, Shielding gas for welding copper and its alloys and stainless steel to prevent the welded parts from being oxidized or nitrided by air. [0003] In recent years, with the development of social economy and the progress of industrial technology, the market demand for high-purity argon is also increasing. For example, argon used in the electronic industry...

AI Technical Summary

Problems solved by technology

However, due to various reasons in some air separation equipment, the purity of the liquid argon produced from the cold box of the air separation equipment is low (the oxygen content is greater than 1ppm), which cannot meet the technical requirements for high-purity liquid argon, and the economic benefits have been greatly limited. ; At the same time, the operation requirements of "safe, stable, long, full, and excellent" for air separation equipment will not give air separation equipment operators a long time for transformation, and they can achieve higher efficiency while minimizing the impact on the original main air separation equipment. Pure liquid argon has become the choice of many manufacturers

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